All of this is true of course but....
I tend to think many people are wired a specific way, you will either be profligate or careful (for want of a better word) It comes from within and in the beginning, im not even sure its a conscience decision, its just what feels right.
Every bit applies to me in a way...
I've always tried (and usually succeeded) to live within my income potential.
I've always tried to limit, or control what debt we have.
I've always saved when I could.
It's never really bothered me having a modest car or house.
I don't really care what anyone else thinks of my status.
Trouble is , I really do think it's hard wired, I'm not sure if someone is generally profligate or needy, you / they can change it ...or that they even want to. (Generally speaking of course, there will always be those in the middle ground that can take something from the advice.
I remember discussing this with my late brother who was always stretched financially. We went through his finances and I told him he could ( if he had told me all his outgoings correctly) save £200 a month.
No firkin way he proclaimed.
You can. I replued...but life will be a bit more boring.
Some people don't want boring or constrained, some people want to live as bigger life as they can.